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Pension Plan and Employee Benefits - Assumed Health Care Cost Trend Rates (Details) - OTHER BENEFITS
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Effect of one-percentage point increase on total of service and interest cost components $ 14
Effect of one-percentage point decrease on total of service and interest cost components (16)
Effect of one-percentage point increase on postretirement benefit obligation 205
Effect of one-percentage point decrease on postretirement benefit obligation $ (229)